/// <summary>
/// Creates a central file header from the information in a local file header.
/// </summary>
/// <param name="localFileHeader">Local file header to </param>
public ZipFileHeader(ZipFileHeader localFileHeader)
{
if (localFileHeader.central)
{
throw new ArgumentException();
}
this.central = true;
this.compressionMethod = localFileHeader.compressionMethod;
this.fileName = localFileHeader.fileName;
this.fileComment = localFileHeader.fileComment;
this.flags = localFileHeader.flags;
this.externalFileAttrs = localFileHeader.externalFileAttrs;
this.internalFileAttrs = localFileHeader.internalFileAttrs;
this.lastModDate = localFileHeader.lastModDate;
this.lastModTime = localFileHeader.lastModTime;
this.crc32 = localFileHeader.crc32;
if (this.zip64)
{
this.versionMadeBy = 45;
this.versionNeeded = 45;
this.compressedSize = UInt32.MaxValue;
this.uncompressedSize = UInt32.MaxValue;
this.diskStart = UInt16.MaxValue;
ZipExtraFileField field = new ZipExtraFileField();
field.fieldType = ZipExtraFileFieldType.ZIP64;
field.SetZip64Data(localFileHeader.compressedSize, localFileHeader.uncompressedSize, localFileHeader.localHeaderOffset, localFileHeader.diskStart);
this.extraFields = new ZipExtraFileField[] { field };
}
else
{
this.versionMadeBy = 20;
this.versionNeeded = 20;
this.localHeaderOffset = localFileHeader.localHeaderOffset;
this.compressedSize = localFileHeader.compressedSize;
this.uncompressedSize = localFileHeader.uncompressedSize;
}
}
public void AddFile(Stream stream, string packageUri, string mimeType, CompressionLevel level)
{
string partName = this.DeterminePartName(packageUri);
ContentType contentType = this.DetermineContentType(partName, mimeType);
ZipFileHeader localFileHeader = new ZipFileHeader(false);
localFileHeader.localHeaderOffset = (uint)this.BaseStream.Position;
localFileHeader.zip64 = stream.Length > 0xFFFFFFFF;
localFileHeader.versionMadeBy = 0;
localFileHeader.versionNeeded = localFileHeader.zip64 ? (ushort)45 : (ushort)20;
localFileHeader.fileName = partName;
localFileHeader.compressionMethod = (level == CompressionLevel.NoCompression) ? ZipCompressionMethod.Store : ZipCompressionMethod.Deflate;
localFileHeader.flags = this.BaseStream.CanSeek ? ZipFileFlags.None : ZipFileFlags.DataDescriptor;
localFileHeader.Write(this.BaseStream);
BlockMapFile blockMapFile = new BlockMapFile(partName)
{
Size = stream.Length, ZipLocalFileHeaderSize = localFileHeader.GetSize()
};
this.blockMapFiles.Add(blockMapFile);
ZipCrc crc = new ZipCrc();
BlockDeflateStream deflate = (level == CompressionLevel.NoCompression) ? null : new BlockDeflateStream(this.BaseStream, (BlockDeflateCompressionLevel)level);
long outputStart = this.BaseStream.Position;
int read = 0;
byte[] buffer = new byte[64 * 1024];
while (0 < (read = stream.Read(buffer, 0, buffer.Length)))
{
crc.UpdateCrc(buffer, 0, read);
string hash;
using (SHA256 sha256 = SHA256.Create())
{
byte[] hashedBytes = sha256.ComputeHash(buffer, 0, read);
hash = Convert.ToBase64String(hashedBytes);
}
long compressedBlockSize = 0;
if (deflate != null)
{
compressedBlockSize = deflate.Deflate(buffer, 0, read);
}
else
{
this.BaseStream.Write(buffer, 0, read);
compressedBlockSize = -1;
}
BlockMapFileBlock block = new BlockMapFileBlock()
{
Hash = hash, CompressedSize = compressedBlockSize
};
blockMapFile.Blocks.Add(block);
}
if (deflate != null)
{
deflate.Flush();
}
else
{
this.BaseStream.Flush();
}
// Update the local file header with data discovered while processing file data.
localFileHeader.crc32 = crc.Crc;
localFileHeader.compressedSize = (uint)(this.BaseStream.Position - outputStart); // (uint)compressedSize;
localFileHeader.uncompressedSize = (uint)stream.Length;
// If we're using the data descriptor (because we can't see), append the updated information to the file data.
if ((localFileHeader.flags & ZipFileFlags.DataDescriptor) == ZipFileFlags.DataDescriptor)
{
localFileHeader.WriteDataDescriptor(this.BaseStream);
}
else // go back to re-write the updated local file header in place, then seek back to our current location.
{
long position = this.BaseStream.Position;
this.BaseStream.Seek(localFileHeader.localHeaderOffset, SeekOrigin.Begin);
localFileHeader.Write(this.BaseStream);
this.BaseStream.Seek(position, SeekOrigin.Begin);
}
// If we have a 64-bit local header then the central directory must be
// ZIP64 as well.
if (localFileHeader.zip64)
{
this.eocd.zip64 = true;
this.eocd.versionMadeBy = 45;
this.eocd.versionNeeded = 45;
}
ZipFileHeader centralFileHeader = new ZipFileHeader(localFileHeader);
this.eocd.CentralDirectory.Add(centralFileHeader);
}
public ZipEndOfCentralDirectory(Stream stream)
{
BinaryReader reader = new BinaryReader(stream);
// Start searching for the Zip End of Central Directory signature from the end
// of the file backwards (towards the beginning of the file). This allows us to
// find Zip archives with extra data appended to the archive (for whatever reason
// someone might want to do that).
long offset = stream.Length - ZipEndOfCentralDirectory.EOCD_RECORD_FIXEDSIZE;
for (; offset >= 0; --offset)
{
stream.Seek(offset, SeekOrigin.Begin);
uint sig = reader.ReadUInt32();
if (sig == ZipEndOfCentralDirectory.EOCDSIG)
{
break;
}
}
if (offset < 0)
{
throw new InvalidDataException("Failed to find end of central directory record.");
}
stream.Seek(offset, SeekOrigin.Begin);
this.Read(stream);
// If the offset to the central directory is DWORD_MAX then this must be a 64-bit
// archive.
if (this.dirOffset == (long)UInt32.MaxValue)
{
string saveComment = this.comment;
stream.Seek(offset - Zip64EndOfCentralDirectoryLocator.EOCDL64_SIZE, SeekOrigin.Begin);
Zip64EndOfCentralDirectoryLocator eocdl = new Zip64EndOfCentralDirectoryLocator(stream);
if (eocdl.dirStartDiskNumber == eocdl.totalDisks - 1)
{
// ZIP64 eocd is entirely in current stream.
stream.Seek(eocdl.dirOffset, SeekOrigin.Begin);
this.Read64(stream);
}
else
{
// TODO: handle EOCD64 spanning archives!
throw new NotImplementedException("Zip implementation does not handle end of central directory record that spans archives.");
}
this.comment = saveComment;
}
// Read the central directory for the archive.
stream.Seek(this.dirOffset, SeekOrigin.Begin);
while (this.headers.Count < this.totalEntries)
{
ZipFileHeader header = new ZipFileHeader(true);
if (!header.Read(stream))
{
throw new InvalidDataException("Missing or invalid central directory file header");
}
this.headers.Add(header);
if (this.headers.Count < this.totalEntries && stream.Position == stream.Length)
{
//streamContext.CloseArchiveReadStream(this.currentArchiveNumber, String.Empty, archiveStream);
//this.currentArchiveNumber++;
//archiveStream = streamContext.OpenArchiveReadStream(this.currentArchiveNumber, String.Empty, this);
//if (archiveStream == null)
//{
// this.currentArchiveNumber = 0;
// archiveStream = streamContext.OpenArchiveReadStream(this.currentArchiveNumber, String.Empty, this);
//}
}
}
}
public IList <ZipFileHeader> GetCentralDirectory(Stream streamContext)
{
Stream archiveStream = null;
//this.currentArchiveNumber = 0;
try
{
List <ZipFileHeader> headers = new List <ZipFileHeader>();
archiveStream = streamContext;
//archiveStream = this.OpenArchive(streamContext, 0);
ZipEndOfCentralDirectory eocd = this.GetEOCD(archiveStream);
if (eocd == null)
{
return(null);
}
else if (eocd.totalEntries == 0)
{
return(headers);
}
headers.Capacity = (int)eocd.totalEntries;
if (eocd.dirOffset > archiveStream.Length - ZipFileHeader.CFH_FIXEDSIZE)
{
//streamContext.CloseArchiveReadStream(this.currentArchiveNumber, String.Empty, archiveStream);
archiveStream = null;
}
else
{
archiveStream.Seek(eocd.dirOffset, SeekOrigin.Begin);
uint sig = new BinaryReader(archiveStream).ReadUInt32();
if (sig != ZipFileHeader.CFHSIG)
{
//streamContext.CloseArchiveReadStream(this.currentArchiveNumber, String.Empty, archiveStream);
archiveStream = null;
}
}
if (archiveStream == null)
{
//this.currentArchiveNumber = (short)(eocd.dirStartDiskNumber + 1);
//archiveStream = streamContext.OpenArchiveReadStream(this.currentArchiveNumber, String.Empty, this);
if (archiveStream == null)
{
return(null);
}
}
archiveStream.Seek(eocd.dirOffset, SeekOrigin.Begin);
while (headers.Count < eocd.totalEntries)
{
ZipFileHeader header = new ZipFileHeader(true);
if (!header.Read(archiveStream))
{
throw new InvalidDataException("Missing or invalid central directory file header");
}
headers.Add(header);
if (headers.Count < eocd.totalEntries && archiveStream.Position == archiveStream.Length)
{
//streamContext.CloseArchiveReadStream(this.currentArchiveNumber, String.Empty, archiveStream);
//this.currentArchiveNumber++;
//archiveStream = streamContext.OpenArchiveReadStream(this.currentArchiveNumber, String.Empty, this);
//if (archiveStream == null)
//{
// this.currentArchiveNumber = 0;
// archiveStream = streamContext.OpenArchiveReadStream(this.currentArchiveNumber, String.Empty, this);
//}
}
}
return(headers);
}
finally
{
//if (archiveStream != null)
//{
// streamContext.CloseArchiveReadStream(this.currentArchiveNumber, String.Empty, archiveStream);
//}
}
}
